Buffer and return device for a slide rail in a drawer

ABSTRACT

A buffer and return device for a slide rail in a drawer, being able to be attached to an outer rail of the drawer includes a base, a buffer plunger and an elastic element. The base has a base chamber at a front section thereof with the base chamber being provided with an air passage, a lateral passageway at another section thereof and a bend bottom slot. The buffer plunger has a size thereof corresponding to the base chamber. The elastic element has an end thereof being fixed to a front end of the base chamber. The retaining plate has a holding way for a lock piece of an inner rail in the slide rail being position locked or released and is in conjunction with the buffer plunger and the elastic element with a lower projection at a bottom thereof for passing through the bottom slot. Once the drawer is pulled outward and then pushed inward, the buffer plunger squeezes the air in the base chamber to discharge via the air passage forcedly so as to slow down a speed of returning to an initial position of the drawer.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a buffer and return device for a slide rail in a drawer, and particularly to a buffer and return device, which is possible for the drawer with the inner rail thereof to return to the original position slowly during the drawer being pushed inward.

[0003] 2. Description of Related Art

[0004] The application of a slide rail is frequently seen and used in our daily life. For instance, a drawer can be pulled outward to extend the length thereof and can be shortened to the original length thereof so that it is possible for the sliding drawer to save more space available than hinge type application. In addition, the sliding door is also an application of slide rail.

[0005] The slide rail, especially the slide rail used in a drawer, can be capable of saving the manual force in case of pushing the drawer inward in addition to the effectiveness of being possible to pull outward. Hence, there are various return devices having been designed and developed such that the drawer can be slid along the slide rail to reach a state of lock before the drawer moving to the very end of the stroke thereof. In fact, too fast slide speed or excessive pushing may result in impact, noise and damage of the drawer so that it is a subject worth us to care with regard to the drawer not only being able to move back to the initial position thereof and but also providing a function of buffer.

SUMMARY OF THE INVENTION

[0006] The crux of the present invention is to provide a buffer and return device for a slide rail in a drawer, being able to be attached to an outer rail of the drawer includes a base, a buffer plunger and an elastic element. The base has a base chamber at a front section thereof with the base chamber being provided with an air passage, a lateral passageway at another section thereof and a bend bottom slot. The buffer plunger has a size thereof corresponding to the base chamber. The elastic element has an end thereof being fixed to a front end of the base chamber. The retaining plate has a holding way for a lock piece of an inner rail in the slide rail being position locked or released and is in conjunction with the buffer plunger and the elastic element with a lower projection at a bottom thereof for passing through the bottom slot. Once the drawer is pulled outward and then pushed inward, the buffer plunger squeezes the air in the base chamber to discharge via the air passage forcedly so as to slow down a speed of returning to an initial position of the drawer.

BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The present invention can be more fully understood by reference to the following description and accompanying drawings, in which:

[0008]FIG. 1 is a perspective exploded view of a buffer and return device for a slide rail in a drawer according to the present invention;

[0009]FIG. 2 is an assembled perspective view of the buffer and return device shown in FIG. 1;

[0010]FIG. 3 is a sectional view of the buffer and return device before the drawer being pulled outward;

[0011]FIG. 4 is a sectional view of the buffer and return device after the drawer being pulled outward;

[0012]FIG. 5 is a perspective view illustrating a retaining plate being arranged next to a buffer plunger provided in the buffer and return device;

[0013]FIG. 6 is a perspective view illustrating the retaining plate engaging with the buffer plunger;

[0014]FIG. 7 is a perspective view illustrating another way of the retaining plate engaging with the buffer plunger;

[0015]FIG. 8 is a perspective view illustrating a section of base in the buffer and return device being not provided with a lower groove thereof being disposed at an outer rail thereof;

[0016]FIG. 9 is a sectional view illustrating an air passage being provided at the inner wall of the base; and

[0017]FIG. 10 is a sectional view illustrating a plug type air passage being adopted.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0018] Referring to FIG. 1, a buffer and return device of the present invention is disposed at an outer rail A, which is slid along with the inner rail B, and the buffering return device is comprised of a base 1, a buffer plunger 2, an elastic element 3 and a retaining plate 4.

[0019] Wherein, the base 1 is fixedly attached to the outer rail A with the front end thereof, i.e., an inner end thereof close to the bottom of the drawer, having an enclosed base chamber 11. In order to be available for ventilating, an air passage 12 is provided in the base 1 and the air passage 12 can be formed with an air hole arranged at the most front end of the base 1 or a blind groove at the inner wall of the base 1. A purpose of the air passage 12 is for the air in the base chamber 11 exhausting slowly during the buffer plunger 2 is pressed forward such that the buffer plunger 2 can move in a slow speed due to the air resistance. Hence, the air passage 12 is related to the air tight between the buffer plunger 2 and the base chamber 11 so that there are various ways for arranging the air passage 12.

[0020] The base 1 at a lateral side of another section thereof may be provided with a hollow passage 13 for being passed through by the elastic element 3. In fact, it is not necessary to provide the hollow passage 13 in case of the elastic element 3 being able to stretch and recoil correctly. Besides, the hollow passage 13 at the bottom thereof can be provided with a lower bend slot 14 for a locating job during stretching and the base 1 at the front end thereof, i.e., on the base 1 or on the outer rail A may provide an engaging jut 15 for fixing an end of the elastic element 3.

[0021] The plunger 2 is elongated with a cylindrical shape preferably but not essentially and preferably is made of elastic material. The plunger 2 at an end thereof is airtight with the base chamber 11 so that a plunger head 21 with a larger diameter can be arranged as the airtight end. In reality, the plunger head can be formed of an annular plunger ring 211 and a central plunger core 212 not joined to the plunger ring 211 such that the plunger ring 211 is thinner in the thickness thereof so as to be capable of being deformed. The plunger head the rear end thereof is provided with a joining part 22 for connecting with the retaining plate 4 and the connecting part disclosed in the embodiment is a through hole. Of course, any other type such as a hook piece can be utilized.

[0022] The elastic element 3 is made of stretchable material such as a spring disclosed in the embodiment. The spring is only an example not to limit the use of the elastic element 3. The spring at an end thereof is engaged to the engaging jut 15 and at another end thereof is joined to the retaining plate 4 so that the elastic element 3 can stretch or coil back as soon as the retaining moves outward or inward.

[0023] The retaining plate 4 has a purpose for engaging with a lock piece C in the inner rail firmly such that two protruding catches 41 with a holding way 42 in between are provided o the retaining plate 4 to locate the lock piece C along the holding way 42. The retaining plate 4 shown is only an example and any other equivalent mode can be used instead. The bottom of the retaining plate 4 has a lower projection 43 (not shown due to the projecting angle) with a size thereof corresponding to the lower slot 14 such that the lower projection 43 can slide along the lower slot 14 and be positioned at the bend corner of the lower slot 14. Besides, the retaining plate also provides an engaging post 44 for being joined to an end of the elastic element 3 and a connecting piece 45 for being joined to the plunger 2.

[0024] Referring to FIG. 2, the assembled buffering return device of the present invention is shown in FIG. 2. When a drawer D is arranged in the inner rail B, the elastic element 3 is stretched and the retaining plate 4 moves outward with the buffer plunger 2 so that the retaining plate 4 can be located at the lock piece D steadily.

[0025] Referring to FIG. 3 in company with FIGS. 1 and 2, the buffering return device of the present invention is disposed at the outer rail A with the rear end thereof, i.e., the pulled end thereof being provided with a stopper. The lock piece C and the drawer are disposed on the inner rail B respectively. FIG. 3 shows the buffering return device has been set up and is in a state of prior to being pulled outward and, meanwhile, the lock piece C falls in the holding way 42 and the elastic element 3 is in a state of being not stretched.

[0026] Referring to FIG. 4, the elastic element 3 is stretched as soon as the drawer is pulled outward with the inner rail B and the lower projection 43 falls into the bend corner of the bottom slot 14 to constitute a position lock. If the drawer is pulled outward further, the retaining plate 4 turns to the lock piece C and is apart from the holding way 42 such that the retaining plate can be free to move outward continuously.

[0027] While the drawer is pushed inward, the retaining plate 4 turns a direction and the lower projection 43 moves to a flat spot from the bend corner of the bottom slot 14. At this time, the elastic element bounces back with a slower speed due to the buffer plunger 2 and the base chamber 11 being airtight with each other and the air therein only discharging through the air passage 12 so that no impact will generate, that is, the drawer D can move back to the initial position with the inner rail 2 by way of the lock piece C falling into the holding way 42.

[0028] Referring to FIG. 5, the buffer plunger 2 is provided in conjunction with the retaining plate 4 and a curvy connection 23 can be added between the buffer plunger 2 and the retaining plate 4. Hence, the connecting piece 45 can be waived from the retaining plate 4.

[0029] Referring to FIG. 6, the retaining plate 4 can be in conjunction with the buffer plunger 2 by way of lock type.

[0030] Referring to FIG. 7, a further way of joining the retaining plate 4 with the buffer plunger 2 to perform the same function.

[0031] Referring to FIG. 8, the base 1 at another end of the base has no bottom part and the outer rail A at the bottom thereof is provided with the bottom slot 14 to carry out the function of position lock.

[0032] Referring to FIG. 9, the air passage 12 is disposed at the inner wall of the base 1 as shown in the sectional view of FIG. 9.

[0033] Referring to FIG. 10, the base 1 at the front end thereof is added with a base plug 14 and the front end has a blind treaded hole for engaging with the outer thread screws on the base plug 14 non-tightly so as to form the air passage 12.

[0034] It is appreciated that buffer and return device for a slide rail in a drawer of the present invention is possible for the drawer with the inner rail thereof to return to the original position slowly during the drawer being pushed inward.

[0035] While the invention has been described with reference to the a preferred embodiment thereof, it is to be understood that modifications or variations may be easily made without departing from the spirit of this invention, which is defined by the appended claims. 

What is claimed is:
 1. A buffer and return device for a slide rail in a drawer, being able to be attached to an outer rail of the drawer, comprising: a base, having a base chamber at a front section thereof with the base chamber being provided with an air passage, having a lateral passageway at another section thereof and having a bend bottom slot; a buffer plunger, having a size thereof corresponding to the base chamber; an elastic element, having an end thereof being fixed to a front end of the base chamber; a retaining plate, having a holding way for a lock piece of an inner rail in the slide rail being position locked or released, being in conjunction with the buffer plunger and the elastic element and having a lower projection at a bottom thereof for passing through the bottom slot; whereby, once the drawer is pulled outward and then pushed inward, the buffer plunger squeezes the air in the base chamber to discharge via the air passage forcedly so as to slow down a speed of returning to an initial position of the drawer.
 2. The buffer and return device for a slide rail in a drawer as defined in claim 1, wherein the air passage is formed by way of grooving on an inner wall of the base being grooved.
 3. The buffer and return device for a slide rail in a drawer as defined in claim 1, wherein the air passage is a hole provided at a front end of the base chamber.
 4. The buffer and return device for a slide rail in a drawer as defined in claim 1, wherein the buffer plunger is arranged integrally with the retaining plate.
 5. The buffer and return device for a slide rail in a drawer as defined in claim 1, wherein the buffer plunger is arranged to engage with the retaining plate.
 6. The buffer and return device for a slide rail in a drawer as defined in claim 1, wherein the base can be provided without the bottom slot and the outer rail is provided with a bottom slot instead.
 7. The buffer and return device for a slide rail in a drawer as defined in claim 1, wherein the buffer plunger at the front end thereof can be an enlarged diameter with being composed of a circumferential ring and a central core.
 8. The buffer and return device for a slide rail in a drawer as defined in claim 1, wherein the elastic element is a spring.
 9. The buffer and return device for a slide rail in a drawer as defined in claim 1, wherein the elastic element at a front end thereof is attached to the base.
 10. The buffer and return device for a slide rail in a drawer as defined in claim 1, wherein the elastic element at a front end thereof is attached to the outer rail.
 11. The buffer and return device for a slide rail in a drawer as defined in claim 1, wherein the air passage is formed of a front end of the base providing a threaded blind hole to engage with a base plug with external screw threads as a non-airtight fit. 